I think you are missing another element of the overall issue, Best Buy is having problems with their business model and appear to be another rudderless ship in the sea of electronics. In the states they just announced that 50 of their stores would be closed. Note that Sony is also having issues. I am trying to figure out if the business model is flawed, customers are changing their tastes or if the overall electronics market has finally saturated.

That being said RIM made some major tactical and strategic errors with the Playbook.